﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class Circle : Shape
    {
        private int radius;

        public int Radius { get => radius; set => radius = value; }

        public override void GetArea(int O)
        {
            
            double area = O * O * 3.14;

            Console.WriteLine("圆形的面积为：{0}",area);
        }
    }
}
